4000018 has 12 divisors (see below), whose sum is σ = 6595470. Its totient is φ = 1818080.

The previous prime is 3999971. The next prime is 4000037. The reversal of 4000018 is 8100004.

It can be written as a sum of positive squares in only one way, i.e., 2614689 + 1385329 = 1617^2 + 1177^2 .

4000018 is a modest number, since divided by 18 gives 4 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 3999971 and 4000007.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8023 + ... + 8506.

Almost surely, 2^4000018 is an apocalyptic number.

4000018 is a deficient number, since it is larger than the sum of its proper divisors (2595452).

4000018 is a wasteful number, since it uses less digits than its factorization.

4000018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553 (or 16542 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 4000018 is about 2000.0044999949. The cubic root of 4000018 is about 158.7403433066.

The spelling of 4000018 in words is "four million, eighteen", and thus it is an aban number.